Abstract:
A fuel system (10) for a gas turbine engine that improves efficiency by supplying fuel to a primary stage (14) and secondary stage (16) via a common fuel source (18) is disclosed. The fuel system (10) may be formed from first and second primary injector assembly stages (20, 22) and a first premix injector assembly stage (24) positioned upstream from a combustor chamber (26), whereby the first premix injector assembly stage (24) is a secondary injector system. The second primary stage (22) and the first premix stage (24) may be in fluid communication with the same fuel source (18) to eliminate duplicative components found within systems where fuel is supplied individually to the second primary stage and the first premix stage. In at least one embodiment, the second primary injector assembly stage (22) and the first premix injector assembly stage (24) may each be in communication with a fuel manifold (28) configured to supply more fuel to the second primary stage (22) than the first premix stage (24).
Abstract:
A dual stage vane pilot nozzle (100) has a non-diffusion nozzle (110) and a first fuel stage (121) and a second fuel stage (122). The first fuel stage (121) has a first fuel injector (101) having first injection holes (103) and a first fuel annulus (105). The second fuel stage (122) has a second fuel injector (102) having second injection holes (104) and a second fuel annulus (106). The non-diffusion (110) does not have a diffusion tip. This arrangement allows for the reduction of nitrogen oxide emissions.
Abstract:
A combustor (100) for a gas turbine engine (30) has a circumferentially extending liner (109) defining at least a portion of an interior combustion chamber (107) and a hot gas path (115). The liner includes a resonator section (112) including at least one resonator (116A, 116B) having a resonator chamber (125A, 125B) formed on an exterior of the liner. A thermal barrier coating (118) is disposed along an inner surface of the liner including an inner surface (130) of the resonator section. The resonator further includes a plurality of apertures (117) and each aperture extends through the liner and the thermal barrier coating at the resonator section and there is fluid flow communication between the combustion chamber and the resonator chamber.
Abstract:
A casting (52) for a support housing (50), including: a fuel manifold (56) comprising an a-stage gas gallery (80) and a b-stage gas gallery (82); a-stage and a b-stage rocket bases (60) integrally cast with the fuel manifold (56), the a-stage gas gallery (80) in fluid communication with the a-stage stage rocket bases and the b-stage gas gallery (82) in fluid communication with the b-stage rocket bases; and one oil tube passageway (64) for each fuel rocket base (60), each oil tube passageway (64) spanning from an upstream end (66) of the fuel manifold (56) to an interior (68) of a respective fuel rocket base (60). Each oil tube passageway (64) is disposed radially inward of an inner perimeter (102) of the b-stage gas gallery (82).
Abstract:
A transition duct exit frame (10) for supporting a transition duct (12) extending downstream from a combustor (14) to a turbine assembly (16) in a gas turbine engine (18) and including one or more transition duct exit frame inserts (20) configured to reduce thermal distortion created during operation of the gas turbine engine (18) is disclosed. The transition duct exit frame (10) is formed from one or more transition duct exit frame bodies (22). The transition duct exit frame body (22) is formed from a first material having a first coefficient of thermal expansion. The transition duct exit frame insert (20) forms at least a portion of the transition duct exit frame body. The transition duct exit frame insert (20) is formed from a second material (26) having a second coefficient of thermal expansion that is different than the first coefficient of thermal expansion of the first material (24) to reduce distortion within the transition duct exit frame body (22) during operation of the gas turbine engine (18).